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wimax/i2400m: fix oops in TX when tearing down the device

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All the entry points into the TX module should check if the device has
been torn down. Otherwise, when the device resets or shuts down, there
are windows when a call to i2400m_tx*() will oops the system.

For that, make i2400m_tx_release() set i2400m->tx_buf to NULL under
the tx_lock. Then, any entry point [i2400m_tx(), _tx_msg_sent(),
_tx_msg_get()] will check for i2400m->tx_buf to be NULL and exit
gracefully.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
This commit is contained in:
Inaky Perez-Gonzalez 2009-10-07 22:46:29 +09:00
parent a0beba21c3
commit 46c501473d
2 changed files with 21 additions and 2 deletions
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5
drivers/net/wimax/i2400m/sdio-tx.c
View File

@ -149,5 +149,8 @@ int i2400ms_tx_setup(struct i2400ms *i2400ms)
void i2400ms_tx_release(struct i2400ms *i2400ms)
{
destroy_workqueue(i2400ms->tx_workqueue);
if (i2400ms->tx_workqueue) {
destroy_workqueue(i2400ms->tx_workqueue);
i2400ms->tx_workqueue = NULL;
}
}

18
drivers/net/wimax/i2400m/tx.c
View File

@ -642,6 +642,9 @@ int i2400m_tx(struct i2400m *i2400m, const void *buf, size_t buf_len,
* current one is out of payload slots or we have a singleton,
* close it and start a new one */
spin_lock_irqsave(&i2400m->tx_lock, flags);
result = -ESHUTDOWN;
if (i2400m->tx_buf == NULL)
goto error_tx_new;
try_new:
if (unlikely(i2400m->tx_msg == NULL))
i2400m_tx_new(i2400m);
@ -697,7 +700,10 @@ int i2400m_tx(struct i2400m *i2400m, const void *buf, size_t buf_len,
}
error_tx_new:
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
i2400m->bus_tx_kick(i2400m); /* always kick, might free up space */
/* kick in most cases, except when the TX subsys is down, as
* it might free space */
if (likely(result != -ESHUTDOWN))
i2400m->bus_tx_kick(i2400m);
d_fnend(3, dev, "(i2400m %p skb %p [%zu bytes] pt %u) = %d\n",
i2400m, buf, buf_len, pl_type, result);
return result;
@ -740,6 +746,9 @@ struct i2400m_msg_hdr *i2400m_tx_msg_get(struct i2400m *i2400m,
d_fnstart(3, dev, "(i2400m %p bus_size %p)\n", i2400m, bus_size);
spin_lock_irqsave(&i2400m->tx_lock, flags);
tx_msg_moved = NULL;
if (i2400m->tx_buf == NULL)
goto out_unlock;
skip:
tx_msg_moved = NULL;
if (i2400m->tx_in == i2400m->tx_out) { /* Empty FIFO? */
@ -829,6 +838,8 @@ void i2400m_tx_msg_sent(struct i2400m *i2400m)
d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
spin_lock_irqsave(&i2400m->tx_lock, flags);
if (i2400m->tx_buf == NULL)
goto out_unlock;
i2400m->tx_out += i2400m->tx_msg_size;
d_printf(2, dev, "TX: sent %zu b\n", (size_t) i2400m->tx_msg_size);
i2400m->tx_msg_size = 0;
@ -837,6 +848,7 @@ void i2400m_tx_msg_sent(struct i2400m *i2400m)
n = i2400m->tx_out / I2400M_TX_BUF_SIZE;
i2400m->tx_out %= I2400M_TX_BUF_SIZE;
i2400m->tx_in -= n * I2400M_TX_BUF_SIZE;
out_unlock:
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
@ -876,5 +888,9 @@ int i2400m_tx_setup(struct i2400m *i2400m)
*/
void i2400m_tx_release(struct i2400m *i2400m)
{
unsigned long flags;
spin_lock_irqsave(&i2400m->tx_lock, flags);
kfree(i2400m->tx_buf);
i2400m->tx_buf = NULL;
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
}